zstd: Update to 1.4.1

Decompression speedup of 7% on average.

Remove upstreamed uClibc-ng patch.

Fixed optimization option to show properly under menuconfig.

Added LTO for smaller size.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

utils/zstd/patches/010-uClibc-ng.patch

@@ -1,11 +0,0 @@
---- a/programs/fileio.c
-+++ b/programs/fileio.c
-@@ -175,7 +175,7 @@ static void clearHandler(void)
- 
- #if !defined(BACKTRACE_ENABLE)
- /* automatic detector : backtrace enabled by default on linux+glibc and osx */
--#  if (defined(__linux__) && defined(__GLIBC__)) \
-+#  if (defined(__linux__) && (defined(__GLIBC__) && !defined(__UCLIBC__))) \
-      || (defined(__APPLE__) && defined(__MACH__))
- #    define BACKTRACE_ENABLE 1
- #  else